Electric conductors used in vacuum environments have smaller cross sections. This report provides data on the correct size wire for a required current load in free-air, low-pressure oxygen, and vacuum environments

Schaefer, J. L.

Svenson, F. C.

English

NASA Technical Reports Server

October 1968	 Brief 68-10362 
NASA TECH BRIEF 
NASA Tech Briefs are issued to summarize specific innovations derived from the U.S. space program, 
to encourage their commercial application. Copies are available to the public at 15 cents each 
from the Clearinghouse for Federal Scientific and Technical Information, Springfield, Virginia 22151. 
Rating of Electrical Wires in Vacuum Environments 
An analytical and experimental investigation has
	 Note: 
shown that electrical conductors to be used in 
vacuum environments can be of smaller cross section 	 Copies of the report may be obtained from: 
(lighter weight) than previously prescribed following 	 Technology Utilization Officer 
standard design guides.	 Manned Spacecraft Center 
Details of the investigation are available in a report
	 Houston, Texas 77058 
which provides data on heat transfer and current-
	 Reference: B68-10362 
carrying capacity of wire and wire bundles. The data 
are arranged to facilitate design engineering selection
	 Patent status: 
of the correct wire size for a required current load 
in free-air, low-pressure oxygen, and vacuum environ-
	
No patent action is contemplated by NASA. 
ments. Curves relating the current for single wires
	 Source: J. L. Schaefer and F. C. Svenson 
and wire bundles to temperature permit the designer 	 of North American Rockwell Corporation 
to determine the maximum allowable current for a
	 under contract to 
given ambient temperature and maximum conductor
	 Manned Spacecraft Center 
temperature.	 (MSC-15108) 
Category 01 
This document was prepared under the sponsorship of the National
	 Government assumes any liability resulting from the use of the 
Aeronautics and Space Administration. Neither the United States
	 information contained in this document, or warrants that such use 
Government nor any person acting on behalf of the United States
	 will be free from privately owned rights.
https://ntrs.nasa.gov/search.jsp?R=19680000362 2020-03-12T05:53:35+00:00Z


Rating of electrical wires in vacuum environments

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